The image above represents structure capacity.

To compute for structure capacity, three essential parameters are needed and these parameters are **Entrance Factor (C), Crest Length (L)** and** Depth of Flow (H).**

The formula for calculating the structure capacity:

Q = CLH^{1.5}

Where:

Q = Structure Capacity

C = Entrance Factor

L = Crest Length

H = Depth of Flow

Let’s solve an example;

Find the structure capacity when the entrance factor is 6, the crest length is 10 and the depth of flow is 12.

This implies that;

C = Entrance Factor = 6

L = Crest Length = 10

H = Depth of Flow = 12

Q = CLH^{1.5}

Q = (6)(10)(12)^{1.5}

Q = (6)(10)(41.56)

Q = 2494.15

Therefore, the **structure capacity** is **2494.15.**

**Calculating the Entrance Factor when the Structure Capacity, the Crest Length and the Depth of Flow is Given.**

C = ^{Q} / _{LH1.5}

Where;

C = Entrance Factor

Q = Structure Capacity

L = Crest Length

H = Depth of Flow

Let’s solve an example;

Find the entrance factor when the structure capacity is 20, the crest length is 8 and the depth of flow is 4.

This implies that;

Q = Structure Capacity = 20

L = Crest Length = 8

H = Depth of Flow = 4

C = ^{Q} / _{LH1.5}

C = ^{20} / _{(8)(8)}

C = ^{20} / _{64}

C = 0.3125

Therefore, the **entrance factor **is **0.3125.**

Continue reading How to Calculate and Solve for Structure Capacity | Water Budget